Justin Bieber has reportedly responded to Sharon Osbourne's recent criticism.
Mrs O was quoted as saying that the teen pop sensation would not "stand the test of time" and claiming he looks like a "little boy".
And according to Digital Spy, Biebs has hit back at the former The X Factor judge on Twitter.
JB wrote: "doubt me...i like it," before adding: "im working on something special."
Then, leaving Beliebers in no doubt that he was referring to Osbourne's predictions, Justin posted a link to his latest video Beauty And A Beat, tweeting the words: "Not worried sharon."
His latest track - featuring Nicki Minaj - was unveiled last week following a publicity stunt in which Biebs claimed "personal footage" had been stolen from his computer.